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Old 16-09-2018   #16
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Re: Possible boost leak

Amazon screwed up my delivery yesterday so had to wait till this morning to get this done but here are the graphs of the four tests @aurick86

Test 1:

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Test 2:

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Test 3:

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Test 4:

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I hope these are good graphs for you and maybe show something that points to my problem?
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Old 16-09-2018   #17
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Clearly overboosting.
Can see the point where the throttle is closing.
Boost is a bit to much almost 1.4 bar.
Has this been remapped?

You need to do a few more tests:
-3rd gear as before, mes
-wastegare solenoid
-intake pressure
-throttle angle
-accelerator pedal possition


Make a few runs where you connect the pressure line from the turbo, directly to the wastegate actuator.
You shouldn't have any more oveboost now, as long as the wastegate is working corretly.
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Old 16-09-2018   #18
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Re: Possible boost leak

Quote Originally Posted by aurick86 View Post
Clearly overboosting.
Can see the point where the throttle is closing.
Boost is a bit to much almost 1.4 bar.
Has this been remapped?

You need to do a few more tests:
-3rd gear as before, mes
-wastegare solenoid
-intake pressure
-throttle angle
-accelerator pedal possition


Make a few runs where you connect the pressure line from the turbo, directly to the wastegate actuator.
You shouldn't have any more oveboost now, as long as the wastegate is working corretly.
To my knowledge it has not been mapped, 1.4 seems high?

Iíll do that test ASAP

Connect the line from boost side directly to the wastegate actuator? Am I bypassing the solenoid doing this?
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Old 16-09-2018   #19
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Re: Possible boost leak

Exactly, bypass it for testing purpouses.
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Old 16-09-2018   #20
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Re: Possible boost leak

Quote Originally Posted by aurick86 View Post
Exactly, bypass it for testing purpouses.
OK I'll get onto that asap

Here's a new graph for you...

Test 5:

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I see what you mean now with the throttle plate being shut off
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Old 16-09-2018   #21
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Re: Possible boost leak

Ok I connected the boost side of the turbo to the wastegate actuator and all this did was make it really slow, the boost guage on the dashboard screen only showed a few bars of boost also, is this normal?
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Old 16-09-2018   #22
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Yep...normal to be slow....and actual good news....it means that the wastegate is doing it's job. It's working.


Investigate the wastegate solenoid, it's wires and lines.

The the problem is there.

The ECU is comanding the wastegate open...but the signal doesn't get performed....it then closes the throttle pate to save the engine.
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Old 16-09-2018   #23
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Re: Possible boost leak

That’s good to know, so there shouldn’t be any issues long term provided I sort out the solenoid? Is the wastegate solenoid the part that MES refers to as the turbo actuator in the graph?
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Old 17-09-2018   #24
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Re: Possible boost leak

Quote Originally Posted by aurick86 View Post
Really?
Haven't you been reading what i've been writing?
GET MES ON IT!!

Make graphs, check values.. check what's going on... as i always say DON'T REPLACE PARTS then complain that it's not working.
Those parts aren't just thrown in to the engine bay.. they have wires, connectors, hoses.. have you checked those?
THe full set of ECU scan kit cost me £126 and I have had value back many times over so I agree with Aurick 86 get a proper scan or you are going to end up replacing all sorts of things that may be OK!!
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Old 17-09-2018   #25
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Re: Possible boost leak

Yes, turbo actuator and wastegate solenoid....same thing.
No long term problems.

The problem area is narrowed down....you just need to fivure out what the issue is, is it the wiring, the solenoid or the vacuum/boost lines.

In the full MES you can trigger the solenoid from the actuator tab. With the engine off, you could hear the solenoid....or do the blow through test(see where the air goes when activated).
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Old 18-09-2018   #26
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Re: Possible boost leak

Quote Originally Posted by The Panda Nut View Post
THe full set of ECU scan kit cost me £126 and I have had value back many times over so I agree with Aurick 86 get a proper scan or you are going to end up replacing all sorts of things that may be OK!!
Yeah I came to my senses and ordered a vagcom 409 for £21 from Amazon, plus the £50 for a registered version of MES on my mrs laptop and after running a few tests it became clear what the issue was, much better than guessing and spending money replacing parts unnecessaraly as I had done. It’s the first turbo car I have owned and have learned a lesson in how to go about dealing with problems that crop up with a turbocharged car.

@aurick86 I tried triggering the actuator in MES and it wouldn’t work, engine off, a warning window came up saying it couldn’t execute. Does this mean the solenoid is done?

I fitted new vacuum hoses to all three outlets and the two wires running into the plug are in good condition. I do have a solenoid arriving tomorrow I ordered two weeks ago from Germany (another part of ordered aimlessly) so hopefully I can bring this thread to a close with some good news tomorrow.
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Last edited by Malarky191; 18-09-2018 at 13:12.
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Old 18-09-2018   #27
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Re: Possible boost leak

I'm not sure the free version of MES can run tests.
I think the 50 version is valid for only one machine.... be careful where you activate it.

The tests won't start until all conditions are met... unfortunately it doesn't always say what the conditions are... in this case it might need the engine running... or even load/boost on the engine.

You can always try the manual way of testing i mentioned a while back:
"use a 9v battery, connect it to the 2 contacts while blowing through the line (the one that has pressure on it from the turbo)... when connected it should click and change the direction of air in the from the turbo intake to the wastegate...(or the other way around)"
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Old 19-09-2018   #28
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Re: Possible boost leak

@aurick86 Well the new solenoid came today, fitted it and connected back up as it should, took it a drive and it’s still making the whooshing noise with no power. I will need to double check my connections and wiring but it’s a bit more frustrating now as I’d thought it would be sorted with that new part :/
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Old 19-09-2018   #29
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Re: Possible boost leak

1.You need to check the wiring NOT JUST visually.
Get out the multimeter, power probe ...etc... the best thing for this would be an oscilloscope.
I can't tell you where the wires go, but i think @Bernievarian can. (talking about the wires that go from ECU to wastegate/ boost solenoid on a Bravo t-jet)

It's probably a constant 5v or 12v that is being grounded by the ECU based on need (similar to a PWM signal).

2.Check the new solenoid 9v battery test.

3. Was this car remapped??
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Last edited by aurick86; 19-09-2018 at 16:46.
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Old 20-09-2018   #30
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Re: Possible boost leak

@aurick86 I came home from work and decided to run another test with MES to see the results and correct me if I'm wrong but it does appear as though there is no more overboost and as such the throttle isn't being closed off by the ecu anymore?

Click image for larger version

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Am I right in thinking that my car is running as it should again? I've been driving with the overboost issue for three weeks now so I've gotten used to it but it feels like things are back to normal after all
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